Are you suggesting "thread cutting screws" as replacement hinge bolts?

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Giles,

I do not recall anyone finding torx head cap screws but Fastenal has a good selection of allen stainless button head cap screws. They are offered in a black oxide finish if you plan to paint them. Somewhere buried in my build thread, I posted results of torque tests I did on the allen heads along with pictures.

This link takes you directly to a cap screw close to what you need, it may be too long for your needs.